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Before: libsystemd-daemonpkg-config(1) After: libsystemd-daemon pkg-config(1) This fix is more complicated than it should be due to the consecutive XML elements separated by collapsible whitespace. Merging the lines and separating the XML elements with an en space or a non-breaking space is the only solution that results in one, and only one, space being inserted between them when testing. An em space results in two spaces being inserted.
194 lines
9.4 KiB
XML
194 lines
9.4 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_pid_get_session" conditional='HAVE_PAM'>
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<refentryinfo>
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<title>sd_pid_get_session</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_pid_get_session</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_pid_get_session</refname>
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<refname>sd_pid_get_unit</refname>
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<refname>sd_pid_get_user_unit</refname>
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<refname>sd_pid_get_owner_uid</refname>
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<refname>sd_pid_get_machine_name</refname>
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<refpurpose>Determine session, service, owner of a session or container/VM of a specific PID</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_session</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>char** <parameter>session</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_unit</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>char** <parameter>unit</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_user_unit</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>char** <parameter>unit</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_owner_uid</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>uid_t* <parameter>uid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_machine_name</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>char** <parameter>name</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_pid_get_session()</function> may be
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used to determine the login session identifier of a
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process identified by the specified process
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identifier. The session identifier is a short string,
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suitable for usage in file system paths. Note that not
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all processes are part of a login session (e.g. system
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service processes, user processes that are shared
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between multiple sessions of the same user, or kernel
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threads). For processes not being part of a login
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session this function will fail. The returned string
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needs to be freed with the libc
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<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para><function>sd_pid_get_unit()</function> may be
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used to determine the systemd system unit (i.e. system
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service) identifier of a process identified by the
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specified PID. The unit name is a short string,
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suitable for usage in file system paths. Note that not
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all processes are part of a system unit/service
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(e.g. user processes, or kernel threads). For
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processes not being part of a systemd system unit this
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function will fail. (More specifically: this call will
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not work for processes that are part of user units,
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use <function>sd_pid_get_user_unit()</function> for
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that.) The returned string needs to be freed with the
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libc
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<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para><function>sd_pid_get_user_unit()</function> may
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be used to determine the systemd user unit (i.e. user
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service) identifier of a process identified by the
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specified PID. This is similar to
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<function>sd_pid_get_unit()</function> but applies to
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user units instead of system units.</para>
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<para><function>sd_pid_get_owner_uid()</function> may
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be used to determine the Unix user identifier of the
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owner of the session of a process identified the
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specified PID. Note that this function will succeed
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for user processes which are shared between multiple
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login sessions of the same user, where
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<function>sd_pid_get_session()</function> will
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fail. For processes not being part of a login session
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and not being a shared process of a user this function
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will fail.</para>
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<para><function>sd_pid_machine_name()</function> may
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be used to determine the name of the VM or container
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is a member of. The machine name is a short string,
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suitable for usage in file system paths. The returned
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string needs to be freed with the libc
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<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para>If the <varname>pid</varname> parameter of any
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of these functions is passed as 0 the operation is
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executed for the calling process.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success these calls return 0 or a positive
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integer. On failure, these calls return a negative
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errno-style error code.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>The <function>sd_pid_get_session()</function>,
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<function>sd_pid_get_unit()</function>,
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<function>sd_pid_get_user_unit()</function>,
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<function>sd_pid_get_owner_uid()</function> and
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<function>sd_pid_get_machine_name()</function>
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interfaces are available as shared library, which can
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be compiled and linked to with the
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<constant>libsystemd-login</constant> <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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<para>Note that the login session identifier as
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returned by <function>sd_pid_get_session()</function>
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is completely unrelated to the process session
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identifier as returned by
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<citerefentry><refentrytitle>getsid</refentrytitle><manvolnum>2</manvolnum></citerefentry>.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>getsid</refentrytitle><manvolnum>2</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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